... WMP /Jan10 /PHYA1 A (a) An unstable nucleus, Z X, can decay by emitting a β– particle (a) Areas outside the box will not be scanned for marking (i) What part of the atom is the same as a β– particle? ... (1 mark) (a) (ii) Calculate the total emf of the combination of cells answer = V (1 mark) (12) WMP /Jan10 /PHYA1 13 Areas outside the box will not be scanned for marking (a) (iii) Calculate ... (a) (i) Calculate the peak voltage of the ac source answer = V (1 mark) (a) (ii) Calculate the rms voltage answer = V (1 mark) (a) (iii) Calculate the time period of the ac signal answer...

... (3 marks) (08) WMP /Jun10 /PHYA1 Do not write outside the box (a) A student wishes to investigate how the resistance of a thermistor changes with temperature (a) (i) Draw a labelled diagram of a ... (c) A filament lamp has a power rating of 36 W when there is a pd across its terminals of 12 V (c) (i) Calculate the resistance of the filament when the pd across its terminals is 12 V answer ... write outside the box When a clean metal surface in a vacuum is irradiated with ultraviolet radiation of a certain frequency, electrons are emitted from the metal (a) (i) Explain why the kinetic energy...

... this equation for alpha decay A Z X→ Y + α (2 marks) (iii) Calculate the specific charge of an alpha particle, stating an appropriate unit answer = (4 marks) (04) WMP /Jun11 /PHYA1 Do not ... The K + kaon is a strange particle Give one characteristic of a strange particle that makes it different from a particle that is not strange (1 mark) (b) (ii) ... WMP /Jun11 /PHYA1 Do not write outside the box 16 (a) (ii) The resistors W, X, Y, and Z all have the same resistance Show that your answer to part (a) (i) is consistent with the resistance of each...

... answer = degrees (2 marks) (06) WMP /Jan10 /PHYA2 Areas outside the box will not be scanned for marking (c) State and explain one reason why part B of the optical fibre is made as narrow as ... WMP /Jan10 /PHYA2 12 Areas outside the box will not be scanned for marking Figure shows a cross-section through a step index optical fibre Figure Light ray in air A B A (a) (i) Name the parts A and ... velocity of zero at A and reaches a constant horizontal velocity at D as it leaves the racket The ball travels a horizontal distance of 0.68 m between D and G (a) (i) Show that the horizontal velocity...

... that the time taken for the cannonball to reach the water surface after being fired from the cannon was 3.7 s Assume the air resistance was negligible (2 marks) (04) WMP /Jan11 /PHYA2 Do not write ... box Figure shows a stationary wave on a string The string is tied onto a thin metal bar at A and fixed at B A vibration generator causes the bar to oscillate at a chosen frequency clamp Figure 1.2 ... string metal bar oscillations A B Explain how a stationary wave is formed Then describe the key features of the stationary wave shown in Figure The quality of your written answer will be assessed...